Pythagoras was not alone in his belief of the sphericity of the Earth pre-Socratic Greek philosopher Anaxagoras (c. He noted how the bowed, crescent shape of the moon's terminator (the line between the bright and dark sides) on the lunar surface changed as the moon passed through its various phases, and how the Earth's shadow, as it crossed the lunar surface during an eclipse, was circular. 25 - Moon at perigee closest to Earth 362,826 kms. Greek philosopher and mathematician Pythagoras (c.570-495 BC), theorized that the Earth might be a sphere his reasoning was based not only on his belief that the most harmonic geometric solid in nature is a sphere but also on his observations of the moon's cycles and eclipses. ![]() It wasn't until the latter part of the sixth century BC that the concept of a spherical Earth began to take root and grow. However, as very little has survived of Phoenecian knowledge of geography and navigation, it appears that, at least then, there wasn't any formalized theory of the Earth as a sphere. ![]() Both these phenomena could only occur, of course, as the result of moving across a curved surface (in this case, the ocean).
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